Description
Memory safety bugs present in Firefox 127 and Thunderbird 127. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 128 and Thunderbird < 128.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | unspecified – < 128 | 128 |
| Mozilla | Thunderbird | unspecified – < 128 | 128 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | mozjs102 | No fix yet | — |
| Ubuntu 22.04 LTS | mozjs78 +2 | No fix yet | — |
| Ubuntu 20.04 LTS | firefox | 128.0+build2-0ubuntu0.20.04.1 | USN-6890-1 |
| Ubuntu 20.04 LTS | mozjs52 +1 | No fix yet | — |
| Ubuntu 18.04 LTS | mozjs38 +1 | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP6 | MozillaFirefox | 128.1.0-150200.152.146.1 | SUSE-SU-2024:3003-1 |
| SLES 15 SP6 | MozillaFirefox-branding-SLE | 128-150200.9.16.1 | SUSE-SU-2024:3003-1 |
| SLES 15 SP6 | MozillaThunderbird | 128.2.3-150200.8.177.1 | SUSE-SU-2024:3507-1 |
| SLES 15 SP5 | MozillaFirefox | 128.1.0-150200.152.146.1 | SUSE-SU-2024:3003-1 |
| SLES 15 SP5 | MozillaFirefox-branding-SLE | 128-150200.9.16.1 | SUSE-SU-2024:3003-1 |
| SLES 15 SP5 | MozillaThunderbird | 128.2.3-150200.8.177.1 | SUSE-SU-2024:3507-1 |
| SLES 15 SP4 | MozillaFirefox | 128.1.0-150200.152.146.1 | SUSE-SU-2024:3003-1 |
| SLES 15 SP4 | MozillaFirefox-branding-SLE | 128-150200.9.16.1 | SUSE-SU-2024:3003-1 |
| SLES 15 SP3 | MozillaFirefox | 128.1.0-150200.152.146.1 | SUSE-SU-2024:3003-1 |
| SLES 15 SP3 | MozillaFirefox-branding-SLE | 128-150200.9.16.1 | SUSE-SU-2024:3003-1 |
| SLES 15 SP2 | MozillaFirefox | 128.1.0-150200.152.146.1 | SUSE-SU-2024:3003-1 |
| SLES 15 SP2 | MozillaFirefox-branding-SLE | 128-150200.9.16.1 | SUSE-SU-2024:3003-1 |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | MozillaFirefox | 128.1.0-112.221.1 | SUSE-SU-2024:2876-1 |
| SLES 12 SP5 | MozillaFirefox-branding-SLE | 128-35.15.1 | SUSE-SU-2024:2876-1 |
| SLES for SAP 15 SP4 | MozillaFirefox | 128.1.0-150200.152.146.1 | SUSE-SU-2024:3003-1 |
| SLES for SAP 15 SP4 | MozillaFirefox-branding-SLE | 128-150200.9.16.1 | SUSE-SU-2024:3003-1 |
| SLES for SAP 15 SP3 | MozillaFirefox | 128.1.0-150200.152.146.1 | SUSE-SU-2024:3003-1 |
| SLES for SAP 15 SP3 | MozillaFirefox-branding-SLE | 128-150200.9.16.1 | SUSE-SU-2024:3003-1 |
| SLES for SAP 15 SP2 | MozillaFirefox | 128.1.0-150200.152.146.1 | SUSE-SU-2024:3003-1 |
| SLES for SAP 15 SP2 | MozillaFirefox-branding-SLE | 128-150200.9.16.1 | SUSE-SU-2024:3003-1 |
| SLES for SAP 12 SP5 | MozillaFirefox | 128.1.0-112.221.1 | SUSE-SU-2024:2876-1 |
| SLES for SAP 12 SP5 | MozillaFirefox-branding-SLE | 128-35.15.1 | SUSE-SU-2024:2876-1 |
| SLE HPC 15 SP4 | MozillaFirefox | 128.1.0-150200.152.146.1 | SUSE-SU-2024:3003-1 |
| SLE HPC 15 SP4 | MozillaFirefox-branding-SLE | 128-150200.9.16.1 | SUSE-SU-2024:3003-1 |
| SLE HPC 15 SP3 | MozillaFirefox | 128.1.0-150200.152.146.1 | SUSE-SU-2024:3003-1 |
| SLE HPC 15 SP3 | MozillaFirefox-branding-SLE | 128-150200.9.16.1 | SUSE-SU-2024:3003-1 |
| SLE HPC 15 SP2 | MozillaFirefox | 128.1.0-150200.152.146.1 | SUSE-SU-2024:3003-1 |
| SLE HPC 15 SP2 | MozillaFirefox-branding-SLE | 128-150200.9.16.1 | SUSE-SU-2024:3003-1 |
| SUSE Enterprise Storage 7.1 | MozillaFirefox | 128.1.0-150200.152.146.1 | SUSE-SU-2024:3003-1 |
| SUSE Enterprise Storage 7.1 | MozillaFirefox-branding-SLE | 128-150200.9.16.1 | SUSE-SU-2024:3003-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 128.0-1.1 | openSUSE-SU-2024:14197-1 |
| openSUSE Tumbleweed | firefox-esr | 128.5.1-1.1 | openSUSE-SU-2024:14572-1 |
| openSUSE Leap 15.6 | MozillaFirefox | 128.1.0-150200.152.146.1 | SUSE-SU-2024:3003-1 |
| openSUSE Leap 15.6 | MozillaFirefox-branding-SLE | 128-150200.9.16.1 | SUSE-SU-2024:3003-1 |
| openSUSE Leap 15.6 | MozillaThunderbird | 128.2.3-150200.8.177.1 | SUSE-SU-2024:3507-1 |
| openSUSE Leap 15.5 | MozillaFirefox | 128.1.0-150200.152.146.1 | SUSE-SU-2024:3003-1 |
| openSUSE Leap 15.5 | MozillaFirefox-branding-SLE | 128-150200.9.16.1 | SUSE-SU-2024:3003-1 |
| openSUSE Leap 15.5 | MozillaThunderbird | 128.2.3-150200.8.177.1 | SUSE-SU-2024:3507-1 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | firefox | 128.0-r0 | — |
Advisories 7
- USN-6890-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- SUSE-SU-2024:2876-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14197-1 MozillaFirefox-128.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:3003-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:3507-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14572-1 firefox-esr-128.5.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2024-1568 Mozilla Firefox und Firefox ESR: Mehrere Schwachstellen BSI CERT-Bund (WID) · Mar 16, 2025